#include <stdio.h>

double factorial(unsigned int i)
{
	if(i <= 1)
	{
		return 1;
	}
	return i * factorial(i - 1);
}
int  main()
{
	int i = 15;
	printf("%d 的阶乘为 %f\n", i, factorial(i));
	return 0;
}
